Join Audio
Combine several audio files into one, in the order you choose.
Free · No upload · 100% on your device
Join Audio
Choose audio files, or drop them here.
MP3, WAV, M4A, OGG, Opus, FLAC, AIFF and more · No size or length limit. Nothing is uploaded.
100% on your device
How to use Join Audio
- Choose your audio files, or drop them on the page.
- Pick the settings in the side panel.
- Select “Join audio”. The first use downloads the video engine once.
- Download the result. Your original file is left unchanged.
Private by design. Your files are processed in this browser tab and are never uploaded to KittySuite.
About Join Audio
Put the files in order with the arrows. Files with different formats, sample rates or channel counts are converted to a common stereo format before joining, so any mix of files works.
Processing happens in this tab with FFmpeg compiled to WebAssembly; your recordings are never uploaded. The first video or audio tool you use downloads the 10 MB engine once and keeps it cached for next time. On phones, files are processed one at a time to stay within memory, and long recordings take a little longer. Keep the tab open until the download appears.
Join Audio: frequently asked questions
How do I join MP3 files into one?
Choose the files, put them in order with the arrows, pick the output format and join them.
Can I join files of different formats?
Yes. Files with different formats, sample rates or channels are converted to a common stereo format before joining.
Which output formats are available?
MP3, M4A, WAV, OGG, Opus and FLAC.
Can I add a gap or crossfade between files?
Not in this tool. Use Fade In and Out on the files first for softer transitions.